I have 2 position estimates (along with their measurement error) and a difference in time between estimates. I estimate velocity using
Velocity = (PosA - PosB)/DeltaT
I am trying to estimate the error in my velocity estimate, but I can't seem to find any ways to calculate this. I assume it has to use Sigma_PosA and Sigma_PosB. I would also assume it's relative to DeltaT and/or abs(PosA - PosB). What is the velocity measurement variance/standard deviation?